Who is the Union Minister of State (Independent Charge) for Science and Technology as of July 2023?

The correct Union Minister of State (Independent Charge) for Science and Technology as of July 2023 is Jitendra Singh.

Explanation:
Dr. Jitendra Singh has held the portfolio of Minister of State (Independent Charge) of the Ministry of Science and Technology. He also serves as the Minister of State (Independent Charge) of the Ministry of Earth Sciences, as well as Minister of State in the Prime Minister's Office; Ministry of Personnel, Public Grievances and Pensions; Department of Atomic Energy; and Department of Space.

Let's briefly look at the other options to understand their roles around that period:
- Dharmendra Pradhan: Served as the Union Minister of Education and Minister of Skill Development and Entrepreneurship.
- Ashwini Vaishnaw: Served as the Union Minister of Railways, Minister of Communications, and Minister of Electronics and Information Technology.
- Ramesh Pokhriyal: Served as the Union Minister of Education previously (resigned in July 2021).

Therefore, the correct option is Jitendra Singh.